你好，我可以负责任地告诉你，正确答案应该是：
When he stepped
When stepping
On(Upon) stepping
The moment he stepped
As soon as he stepped
....
你这两个选项绝对有问题！ 我是教高中的，这个难道不知道？！
你好，老师，这题的答案确实错了，嘿嘿，您讲的很对哦，你知道了就好。
第二个对. 第一个answer是名词,要加上冠词an或者the. 第二个answer the question的answer是动词.这是祈使句....
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